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PATH: usr / lib / python3.9 / site-packages / dns

# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license

# This implementation of the immutable decorator requires python >=
# 3.7, and is significantly more storage efficient when making classes
# with slots immutable.  It's also faster.

import contextvars
import inspect

_in__init__ = contextvars.ContextVar("_immutable_in__init__", default=False)

class _Immutable:
    """Immutable mixin class"""

# We set slots to the empty list to say "we don't have any attributes".
    # We do this so that if we're mixed in with a class with __slots__, we
    # don't cause a __dict__ to be added which would waste space.

__slots__ = ()

def __setattr__(self, name, value):
        if _in__init__.get() is not self:
            raise TypeError("object doesn't support attribute assignment")
        else:
            super().__setattr__(name, value)

def __delattr__(self, name):
        if _in__init__.get() is not self:
            raise TypeError("object doesn't support attribute assignment")
        else:
            super().__delattr__(name)

def _immutable_init(f):
    def nf(*args, **kwargs):
        previous = _in__init__.set(args[0])
        try:
            # call the actual __init__
            f(*args, **kwargs)
        finally:
            _in__init__.reset(previous)

nf.__signature__ = inspect.signature(f)
    return nf

def immutable(cls):
    if _Immutable in cls.__mro__:
        # Some ancestor already has the mixin, so just make sure we keep
        # following the __init__ protocol.
        cls.__init__ = _immutable_init(cls.__init__)
        if hasattr(cls, "__setstate__"):
            cls.__setstate__ = _immutable_init(cls.__setstate__)
        ncls = cls
    else:
        # Mixin the Immutable class and follow the __init__ protocol.
        class ncls(_Immutable, cls):
            # We have to do the __slots__ declaration here too!
            __slots__ = ()

@_immutable_init
            def __init__(self, *args, **kwargs):
                super().__init__(*args, **kwargs)

if hasattr(cls, "__setstate__"):

@_immutable_init
                def __setstate__(self, *args, **kwargs):
                    super().__setstate__(*args, **kwargs)

# make ncls have the same name and module as cls
        ncls.__name__ = cls.__name__
        ncls.__qualname__ = cls.__qualname__
        ncls.__module__ = cls.__module__
    return ncls

[-] enum.py [edit]
[-] rdata.py [edit]
[-] resolver.py [edit]
[-] _asyncbackend.py [edit]
[-] message.py [edit]
[-] e164.py [edit]
[+] rdtypes
[-] win32util.py [edit]
[-] zone.py [edit]
[-] versioned.py [edit]
[-] tokenizer.py [edit]
[-] tsig.py [edit]
[-] xfr.py [edit]
[-] tsigkeyring.py [edit]
[-] set.py [edit]
[-] rdataset.py [edit]
[-] dnssec.py [edit]
[-] namedict.py [edit]
[-] nameserver.py [edit]
[-] wire.py [edit]
[-] _immutable_ctx.py [edit]
[-] immutable.py [edit]
[-] opcode.py [edit]
[-] ttl.py [edit]
[-] asyncresolver.py [edit]
[-] __init__.py [edit]
[-] name.py [edit]
[-] _ddr.py [edit]
[-] rdatatype.py [edit]
[-] rcode.py [edit]
[-] rrset.py [edit]
[-] zonefile.py [edit]
[-] edns.py [edit]
[-] renderer.py [edit]
[+] ..
[-] _features.py [edit]
[-] zonetypes.py [edit]
[-] asyncquery.py [edit]
[-] dnssectypes.py [edit]
[-] grange.py [edit]
[-] transaction.py [edit]
[-] asyncbackend.py [edit]
[-] reversename.py [edit]
[+] dnssecalgs
[-] entropy.py [edit]
[-] ipv4.py [edit]
[-] inet.py [edit]
[-] version.py [edit]
[-] _asyncio_backend.py [edit]
[+] __pycache__
[-] update.py [edit]
[-] exception.py [edit]
[-] ipv6.py [edit]
[+] quic
[-] serial.py [edit]
[-] node.py [edit]
[-] flags.py [edit]
[-] rdataclass.py [edit]
[-] query.py [edit]